Floor plan optimization city villa + fill consideration

Our general contractor specified a wall construction of 44 cm in the construction service description. With a different construction, I could have a few more square meters with the same exterior dimensions.

Tell me about your wall construction. But if 44 minus 36.5 equals 8.5 cm more than just nominal additional square meters – that is, if this extra width of a room were "decisive" somehow – honestly, I would call that a planning error.

I rather believe that at 44 plaster was already taken into account, which would also be added at 36.5 cm. So we're talking more about 44 versus 40.5 or so. So even less...

Tell me about your wall construction. But if 44 minus 36.5 equals 8.5 cm more than just nominal additional square meters – so if this extra width of a room would be "decisive in a war" somewhere, I would frankly speak of a planning error.

It’s nothing decisive in a war, it was “just” an assumption on my part that it might give more square meters without enlarging the house. It could have been that my general contractor plans differently for some reason.

It could have been that my general contractor planned differently for some reason.

As long as you don't tell me otherwise, I suspect that the "other reasons" are just "short fifty": 24 cm wall and the U-value calculator spits out 20 cm insulation cardboard for it. There are no better hunting grounds for carelessly cobbled-together contemporaries than the business of the construction contractor.

As long as you don’t tell me otherwise, I suspect behind the "other reasons" just a "short fifty": 24 cm wall and the U-value calculator spits out 20 cm insulation board. There are no better hunting grounds for careless contemporaries than the business of the construction contractor.

The construction specification states: Facing masonry: facing bricks in NF format

Two-shell masonry with a total thickness of 45 cm. The inner shell consists of 17.5 cm thick aerated concrete blocks as plan stone (0.10 W/m x K) compressive strength PP2, glued with plan mortar, according to static drawing and static calculation. 14 cm hydrophobized (water-repellent) core insulation board KDII (WLG 035) with staggered joints. Wall ties made of V4A steel, 2 cm air layer. The U-value is 0.16 W (m²K). To prevent rising moisture, a horizontal barrier layer is installed under the first layer as a bitumen sheet G200 DD with an L-barrier foil above it. In addition, the base is sealed with a thick bitumen coating.

Facing masonry: facing bricks in NF format Two-shell masonry with a total thickness of 45 cm. The inner shell consists of 17.5 cm thick aerated concrete blocks as plan stone (0.10 W/m x K) compressive strength PP2, bonded with plan mortar, according to static drawings and static calculations. 14 cm hydrophobic (water-repellent) core insulation board KDII (WLG 035) with staggered joints. Wall ties made of V4A steel, 2 cm air layer.

NF practically means 11.5 cm thick; as facing bricks in front of an ETICS and air layer, it practically only works that way. Was the cladding your request? – I interpret 14 cm here as the sum of two layers; otherwise, the mention of staggered joints would make no sense. If you wanted monolithic, I would put the facing bricks as slips on top and rather use more stone (30 cm); in 36.5 cm stone "behind" the facing bricks, the total thickness difference would be even smaller – keep in mind my mantra "use the wall structure your installer is accustomed to."